First of all, hardboard, I assume you mean masonite, goes rough side up. If nailed, you must use ring shank nails. You can get by with luan, although in such a small area, I would put down multiply or some other underlayment grade plywood. Make sure the nails aren't coming up because the subfloor is getting soft. Do not put the underlayment down with screws, it can pucker at each screw head. Either nail with ring shank or better yet staple with 1/4" galvanized crown staples at least 9/16" in length. Fasten every 4" in the field and every 2" along any seam. then patch the seams with a cementious based patch.
__________________Floor Covering Installer for almost 40 years.
Armstrong Certified.
"Don't ask me how to do it right and then do it wrong"
Source: http://www.diychatroom.com/f5/bathroom-floor-advice-please-104344/
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